Keyboard



FIG. 1 is a perspective view of a keyboard;

FIG. 2 is a top plan view of the keyboard of FIG. 1.

FIG. 3 is a front view of the keyboard of FIG. 1.

FIG. 4 is a rear view of the keyboard of FIG. 1.

FIG. 5 is a left side view of the keyboard of FIG. 1; and,

FIG. 6 is a right side view of the keyboard of FIG. 1.

The broken lines in the drawings illustrate portions of the keyboardwhich form no part of the claimed design .

CLAIM The ornamental design for a keyboard, as shown and described.